File:Lock 60 C and O Canal from NPS.jpg
Lock_60_C_and_O_Canal_from_NPS.jpg (700 × 525 pixels, file size: 103 KB, MIME type: image/jpeg)
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Summary
[edit]DescriptionLock 60 C and O Canal from NPS.jpg |
English: Lock 60, 3rd Composite lock, on Chesapeake and Ohio Canal. NPS site says: Lock 60 is the third of the 13 composite locks. These locks differ from the other locks on the canal. Between the upper end of the lower gate pockets to the lower end of the upper gate pockets the stone walls were moved 9 and one-quarter inches on each side, resulting in a clear dimension between lock walls of 16 to 16 and one-half feet rather that the 15 feet previously adhered to. The normal clear dimension was resumed both up and down from these points. The walls were of rough-cut and rough-coursed limestone, principally dry-laid where the walls were widened and mortared in the other areas. The wider area was filled in with 5 one-quarter inch square timbers. This wooden section of the lock was “water-proofed” at first by being “kyanized” and later with creosote.
The wood timbers required frequent replacing, and around 1900 many repairs were made by stripping out the wood and pouring a cement liner, but at Lock 60 cement was not used. All of the wood coping and most of the wood lining at Lock 60 is gone, but a few remnants remain. In the mid-1870s, Lock 60 was extended at its lower end by rock-filled wood cribbage, in order to double its length. The wooden portion of the extension is gone, but the lines of rock remain |
Source | National Park Service: http://www.hscl.cr.nps.gov/insidenps/report.asp?STATE=&PARK=CHOH&STRUCTURE=&SORT=&RECORDNO=935 |
Author | National Park Service, Dept of Interior, US Government |
Licensing
[edit]Public domainPublic domainfalsefalse |
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This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information. | ![]() |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:16, 4 June 2013 | ![]() | 700 × 525 (103 KB) | Bonnachoven (talk | contribs) | {{Information |Description ={{en|1=Lock 60, 3rd Composite lock, on Chesapeake and Ohio Canal. NPS site says: Lock 60 is the third of the 13 composite locks. These locks differ from the other locks on the canal. Between the upper end of the lower gat... |
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Camera manufacturer | Panasonic |
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Camera model | DMC-TZ1 |
Exposure time | 1/160 sec (0.00625) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 11:00, 1 November 2007 |
Lens focal length | 5.2 mm |
Author | Picasa 2.7 |
Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Picasa 3.0 |
File change date and time | 11:00, 1 November 2007 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 11:00, 1 November 2007 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | Uncalibrated |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 35 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | bad141d43fbb9ce964f2ae77b1563f8c |